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Thermal analysis of ferrous sulphate heptahydrate in air

II. The oxidation-decomposition path

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Abstract

The thermal decomposition of ferrous sulphate heptahydrate was carried out in air under dynamic and isothermal conditions. The intermediate phases were identified by chemical analysis and an X-ray technique. Ferrous sulphate heptahydrate is converted to tetrahydrate and monohydrate, but this conversion is accompanied by oxidation. Fe(OH)SO4 and Fe2O(SO4)2 are formed as oxidation products, and the latter decomposes to ferric oxide directly and/or through Fe2(SO4)3.

Résumé

La décomposition thermique dans l'air du sulfate de fer(II) heptahydraté a été étudiée en conditions dynamiques et isothermes. Les phases intermédiaires ont été identifiées par analyse chimique et par rayons X. Le sulfate de fer(II) heptahydraté se transforme en tétrahydrate et en monohydrate mais cette conversion s'accompagne d'une oxydation. Il se forme Fe(OH)SO4 et Fe2O(SO4)2 comme produits d'oxydation et ce dernier se décompose en oxyde de fer(III) directement ou quelquefois avec formation intermédiaire de Fe2(SO4)3.

Zusammenfassung

Die thermische Zersetzung von Eisen(II)sulfat Heptahydrat wurde in Luft unter dynamischen und isothermen Bedingungen durchgeführt. Die Intermediärphasen wurden durch chemische Analyse und Röntgentechnik identifiziert. Eisen(II)sulfat Heptahydrat wird in Tetrahydrat und Monohydrat überführt, doch wird diese Umwandlung durch eine Oxidation begleitet. Fe(OH)SO4 und Fe2O(SO4)2 werden als Oxidationsprodukte gebildet und letzteres wird unmittelbar und/oder über Fe2(SO4)3 zu Eisen(III)oxid zersetzt.

Резюме

Проведено термическ ое разложение гептаг идрата сульфата железа(II) в воз душной атмосфере в динамиче ских и изотермически х условиях. С помощью химического анализа и рентгеногр афии идентифицирова ны промежуточные фазы. Г ептагидрат сульфата железа(II) превращается до тетрагидрата и мон огидрата с сопровождающимся пр и этом окислении. В качестве продуктов окисления образуются Fe(OH)SO4 и Fe2O(SO4)2. Последний продукт разлагается до окиси железа(III) прям о или через образование Fe2(SO4)3.

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References

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Authors and Affiliations

  1. Regional Research Laboratory, 751013, Bhubaneswar, India

    M. S. R. Swamy, T. P. Prasad & B. R. Sant

Authors
  1. M. S. R. Swamy
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  2. T. P. Prasad
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  3. B. R. Sant
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Additional information

The authors express their grateful thanks to Prof. P. K. Jena, Director, for his keen interest and permission to publish the paper, and to Dr. A. Lakshminarayana for the X-ray measurements. One of us (MSRS) also thanks the Regional Research Laboratory (CSIR) for a fellowship.

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Swamy, M.S.R., Prasad, T.P. & Sant, B.R. Thermal analysis of ferrous sulphate heptahydrate in air. Journal of Thermal Analysis 16, 471–478 (1979). https://doi.org/10.1007/BF01910710

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  • DOI: https://doi.org/10.1007/BF01910710

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